client.java

《Java与模式》一书的源代码

package com.javapatterns.memento.whiteboxcheckpoints;

public class Client
{
    private static Originator o = new Originator();
    //correction
    private static Caretaker c;

    //correction
    public static void main(String[] args)
    {
        c = new Caretaker(o);

        o.setState("state 0");
        c.createMemento();

        o.setState("state 1");
        c.createMemento();

        o.setState("state 2");
        c.createMemento();

        o.setState("state 3");
        c.createMemento();

        o.setState("state 4");
        c.createMemento();

        o.printStates();

        System.out.println("Restoring to 2");
        c.restoreMemento(2);
        o.printStates();

        System.out.println("Restoring to 0");
        c.restoreMemento(0);
        o.printStates();

        System.out.println("Restoring to 3");
        c.restoreMemento(3);
        o.printStates();

    }
}